Ballistic gun.



PATENTBD MAR. zo, 1906;

, y 1221; DU PONT.

'BALLISTIG GUN .V- APPLIUTIOI FILED NOV. 1905.

M\ Mm m yFRANCIS I.. DU PONT, OF WILMINGTON,

To all whom, it may concern/:f

1. DU PONT DE NEMOURS PO WDER COMPANY, OF WiLMiNGTON,

DELAWARE, AssIGNOR TO THE DELAWARE, A'OORPORATION OE NEW JERSEY. BALLISTIC G UN. i i

i `Specification of Letters Patent.

Patented Maren 2o, moe.

Application led November 4, 1905. Serial No. 285,815.

Beit known that I, FRANCIS I. DU PONT, a citizen of the United States, residing at Wilmington, county of Newcastle, and-State ofy Delaware, have invented anew and useful Improvement in Ballistic Guns, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this speciication. v

My improvement` relates to that' class of ..fguns which aroused to ascertain the ressure eveloped by lthe powder and in w 'ch the pressure ofthe powder is delivered upon a l tridge C.

.made throu h breech and t piston which acts upon a copper Scylinder, compressing or shortening, or tending to compress or shorten, this cylinder. The amount of such compression-or shortening is measured and the pressure is determined thereby. In the ordinary construction an Aorifice is the cartridge-case near the e'piston is su portedl or secured just above this oriiice. T edisadva`ntage in thisconstruction is that the gas 'esca es not only around the piston, but back an Aout of the breech, thus tending to make the result uncertain. z

'lfhe object of my invention is to avoid these defects and render the` result more certain. I Will virst describe the embodiment of --my invention whereby I' obtain these results,

disclosed' in the accompanying drawings, and then point out the invention in the claims.

In the drawin s, Figure 1 isa longitudinal sectional view o the gun. Fig. 2 is atransverse sectional view on the line 2 2, Fig. 1.

A is the gun-chamber in which is the car- D is the breech, which is secured'to the gunI and removed therefrom by the threads d on the breech coactingvwith threads d on the gun. Between the cartridge, and the inner end of the breech when in position is the space K, which is filled with oil. E is a passage through the guncasing communicating with the spa'ce K, in which passage is `thepiston F, theu per end being connected with the compressible copper cylinder G. .H is another passage ythrough the uri-'casing communicating with the s ace K. his passage may be closed or opene by the.

valve I.

In practice Iy first remove the breech and than could tridge-head and the -insert the loaded cartridge.

inclined and oil suilicient in space K is poured in. moved to open 'assage H and the breech D is screwed in, t e gun stillvbeingheld in an yinclined position. As the breech is screwed infirst the air -escapes out throughpassage H quantity to fill lThe gun is then .55. The valve is then 1 and then any excess of oil escapes in the same manner. to the. proper position the -valve I is closed.

The` gunis then fired by tapping the firingpin J with a'hammer. The cartridge comes ack, compressing the oil in s ace K, lthus transmitting the pressure to ltlie piston F, Which in turn com resses or shortens the copper cylinder G. 'Phe amount of the compression or shortening of the co per cylinder is` carefully measured, and in the customary manner this is used to indicate the pressure developed inthe chamber'of the gun.

After they breech has been Lscrewed By. my improved construction there is no necessity to case, and all openings which might Otherwise make a hole inA the cartridge-I leak are oil-sealed.. In other words, before any gas can escape from anything it would be necessary for moreoil to ilow out of them possibly happen in the very short interva of time such which the pressure exists.v v

Having now fully described my invention, whatI claim, and desire to'protect by Letters Patent', is-

1. An'improved'ballistic gun comprising a chamber containing oil between the cartridge-head and the breech when closed, a pistonin operative communication with said chamber and a pressure-indicating device koperated by said piston.

2. An improved ballistic gun comprising a chamber between the cartridge-head and the breech when closed, a communication with sai chamber and pressure-indicating device operated ,by said piston. f

3. An improved ballisticgun comprising a chamber containin voil between the carreech when closed, a piston in operative communication with said s chamber and a pressure-indicating device op-` erated by said piston, and a passage controlled by a valve connecting said chamber and the exterior'of the gun.

4. An improved ballistic gun comprising a as that during fiston in Operative IOO 6. In a ballistic gun in combination, a

chamber adapted to receive the cartridge, av

. breech ada ted to close the end of said gun, a

chamber a apted to receive oil between the cartridge-chamber and the inner end of the breech, a piston in connection with said oilchamber and a compression or 'shortening cylinder operated by said piston. v

7. In a ballistic gun, in combination, a chamber adapted to receive the cartridge, a breech adapted to close the end of said gun, a

chamber adapted to receive oil between the cartridge-chamber and the inner end of the breech, a piston in connection with said oilchamber and a measuring device operated by said piston, a passage from said oil-chamber to the exterior of the gun and a valve controlling said passage.

8. In a ballistic gun, in combination, a chamber adapted to receive the cartridge, va breech adapted to close the end of said gun, a chamber adapted to receive oil between the cartridge-chamber and the inner end of the breech, a piston in connection with said oilchamber and a compression or shortening cylinder operated by said iston, a passage from said oil-chamber to t e exterior of the gun and a valve controlling said passa e.

In testimony of which invention have hereunto set my hand, at Wilmington, Delaware, on this 31st day of October, 1905.

FRANCIS' i. DU PONT.

Witnesses z IRVING EYER, ROY SHARPE. 

